5S or 4S

[neweuser]

Well, I run 4s in my maxx and it's fine. But I use a different motor. 5s is about the limit for the 9920. Personally, unless you have a long straight away on the track, doing more than 35 is pretty much useless. And yes, you would need an LVC, Mike sells the li saver for cars which is good. You could go with the A123 cells if it's better for you. Also, I would think 6s is going to be some weight...my 5s is pretty heavy, but they are also 8000mah.